Hi mama! First things first, please talk to your OB about this at your next visit or sooner if you're worried, okay? They know your full picture best and can explain what it means for your pregnancy.
I know it's scary when the ultrasound shows something "high normal", but you're doing great by paying attention and asking! Most of the time, these things are just how baby's developing, and your doctor will keep an eye on it. Focus on eating healthy (fruits, veggies, protein, plenty of water!) and following your OB's advice, that's really all you can do. You've got this, and you're not alone in worrying about every detail. Kaya mo yan!